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National Coffee Day is Saturday, September 29, and Dunkin' Donuts has stirred up several exciting ways to celebrate the holiday, including two brand new varieties of coffee, a special value offer to enjoy Dunkin' Donuts coffee at home, and the brand's biggest-ever Twitter sweeps.

Kicking off the National Coffee Day festivities, Dunkin' Donuts unveiled Pumpkin Mocha and Pumpkin White Chocolate coffee and lattes.

Available hot or iced, the two flavors join Dunkin' Donuts' Pumpkin Coffee as the perfect way to enjoy a taste of fall any time of day. Pumpkin Mocha and Pumpkin White Chocolate coffee and lattes are available for a limited time at participating Dunkin' Donuts restaurants nationwide.

Dunkin' Donuts has also brewed a big opportunity for guests to bring home America's Favorite Coffee at a discounted price. For two days only, September 29 and 30, Dunkin' Donuts' 16-ounce packaged coffee is available for only $5.99 at participating Dunkin' Donuts restaurants nationwide while supplies last, with a limit of two per guest.

Available in flavors like Original Blend, Dunkin' Decaf, and French Vanilla, Dunkin' Donuts' packaged coffee is a great way to enjoy the taste of fresh Dunkin' Donuts coffee at home.

Finally, Dunkin' Donuts is marking National Coffee Day with the brand's biggest Twitter sweeps ever. Beginning September 28 and continuing through September 30, Dunkin' Donuts' National Coffee Day Twitter Sweepstakes invites fans to share with @DunkinDonuts on Twitter how they take their Dunkin' coffee using the special hashtage #DunkinNCD.

Five hundred and ninety-nine winners will be randomly selected from all participants to receive a 16-ounce bag of Dunkin' Donuts packaged coffee.

"National Coffee Day is the perfect occasion to recognize the important role coffee plays in people's everyday lives, whether starting your morning right or keeping you running all throughout the day," says John Costello, chief global marketing and innovation officer at Dunkin' Brands. "As the nation's coffee leader, we're excited to celebrate this holiday with the introduction of new coffee flavors, a Twitter sweepstakes, and a special discount on packaged coffee to make it fun, easy, and affordable for our loyal fans to enjoy our coffee this weekend."